However, a static configuration is perhaps unlikely in real systems,
and the blue offset seen for this DLA host may arise because of an
inflowing gas geometry
[1]}, [2]}.
[3]} have modelled the spectra and
surface brightness distributions for the Ly\(\alpha \)  radiation from
collapsing protogalaxies. They demonstrate that due to transfer of
energy from the collapsing gas to the Ly\(\alpha \)  photons, together with a
reduced escape probability for photons in there wing, causes the blue
peak to be significantly enhanced, which results in an effective
blueshift of the Ly\(\alpha \)  line. Furthermore, employing a
three-dimensional Ly\(\alpha \)  radiative transfer code,
[4]} have investigated the properties
of young Ly\(\alpha \)  emitting galaxies at high redshift (z \(\sim \)  3) from a
cosmological galaxy formation simulation and found the dominant blue
peak showing the signature of infalling gas [5]}. Such Ly\(\alpha \)  emission profiles
with prominent blue peaks and suppressed red peaks, with typical
offset of a few hundred km s\(^{-1}\)  as seen here, have been observed in
several Ly\(\alpha \)  blobs
[6]}, [7]}, LAEs
[8]} as well as one high confidence DLA
by [9]} in VLT-MUSE observations.
